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Troubleshooting and Maintenance
11.3.3 Upgrading Firmware
Upgrade precautions
WARNING!
• Please make sure that the category format is correct, do not modify the firmware file
name. Otherwise, the inverter may not work!
WARNING!
• Before proceeding with the upgrade process, ensure that the PV input voltage is
above 180 V (preferably on sunny days), or that the battery (SOC) is above 20%, or the
battery input voltage is above 180 V. Failure to meet these conditions may result in
upgrade process failure.
Upgrade preparation
• Please check the inverter version and prepare a U disk (USB 2.0/3.0) and personal
computer before upgrading. Please make sure that the size of the U disk is smaller
than 32G, and the format is FAT 16 or FAT 32.
• Please contact our service support to obtain the firmware, and store the firmware
in the U disk.
»
For ARM file: XXX.XXXXX.XX_ULT_3P_ARM_VXXX.XX_XXXX.usb
»
For DSP file: XXX.XXXXX.XX_ULT_3P_DSP_VXXX.XX_XXXX.usb
Upgrade steps
a. Please save the upgrade firmware in your U disk, and press the Enter key on the
inverter screen for 5 seconds to enter the OFF mode.
b. Find the UPGRADE terminal of the inverter, unplug the monitoring module by
hand, and insert the USB flash drive. (Refer to section "7.1 Terminals of Inverter"
for the specific position of UPGRADE terminal.
c. Select ARM and OK to enter the software version interface.
===Upgrade Selection===
>ARM
DSP
====Upgrade (ARM)====
Cancel
>OK
d. Please confirm the new firmware version again and select the firmware to
upgrade. The upgrade takes about 20 seconds. When it is completed, the LCD
screen returns to the Update page.
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